Source of sgiioc4.c - linux-imx - PHYTEC BitBucket (Stash)

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             IOC4_DMA_OFFSET;
​
    hwif->sg_max_nents = IOC4_PRD_ENTRIES;
​
    hwif->prd_max_nents = IOC4_PRD_ENTRIES;
    hwif->prd_ent_size = IOC4_PRD_BYTES;
​
    if (ide_allocate_dma_engine(hwif))
        goto dma_pci_alloc_failure;
​
    pad = pci_alloc_consistent(dev, IOC4_IDE_CACHELINE_SIZE,
                   (dma_addr_t *)&hwif->extra_base);
    pad = dma_alloc_coherent(&dev->dev, IOC4_IDE_CACHELINE_SIZE,
                   (dma_addr_t *)&hwif->extra_base, GFP_KERNEL);
    if (pad) {
        ide_set_hwifdata(hwif, pad);
        return 0;
    }
​
    ide_release_dma_engine(hwif);
​
    printk(KERN_ERR "%s(%s) -- ERROR: Unable to allocate DMA maps\n",
           __func__, hwif->name);
    printk(KERN_INFO "%s: changing from DMA to PIO mode", hwif->name);